Description

The Zektor is Zeals' go to glass for those
who want protection and performance in a sporty yet classic
shape.

Like pillows for your eyes, Zeal's exclusive
ZB-13 POLARISED lenses are one of the most relaxing experiences
you will ever have. The proprietary ZB-13 lens colour soothes
your eyes, enhances vision and allows for your eyes to adjust
to the always-changing lighting conditions.

It provides optimum blend of contrast, clarity
and light transmission for all day COMFORT for your eyes.
The layered polarised lens filter, cuts our horizontal glare
experienced with sports such as driving, water and snow activities.

Over the years, Zeal have tested lens colours
and treatments to find the ultimate in PERFORMANCE blend of
lens colour. ZB-13 POLARIZED is an enticing mix of all that
is soothing and enhancing in colour.

Why Buy Polarised?:
Light waves travel in all directions: horizontally, vertically,
and on every plane in between. When light strikes a surface,
some waves are reflected. The reflected light waves tend to
vibrate in parallel planes. This uniform, non-random concentration
of reflected light is commonly referred to as glare. Glare
is not only unpleasant but is a common cause of eye strain
and fatigue; it can also be dangerous because it reduces contrast
and visual acuity.

Polarised lenses are designed to substantially
reduce or eliminate reflective glare by selectively absorbing
the light waves travelling in all directions except the vertical
plane. The term “polarised” is used to describe
light that has passed through a polarising filter. As a result
of passing through the filter, the transmitted light travels
in a uniform pattern.

Ordinary darkly tinted sunglasses do not remove glare and
may reduce vision by limiting the amount of light entering
the eye. It is not necessary to apply additional tint to polarised
lenses because performance is gained by cutting glare and
allowing a greater transmission of light. This results in
better overall vision.

The exclusive ZB-13 POLARISED blended ‘sepia’
lens colour soothes your eyes, enhances vision and allows
for your eyes to adjust to the always-changing light conditions.
It provides the optimum blend of contrast, clarity and light
transmission for all day COMFORT for your eyes.

The layered polarised lens filter cuts out
the glare experienced with outdoor environments and means
enhanced vision in a wider range of conditions.

Complete with Lifetime Warranty - Zeal Optics
offer a liftetime warranty on all Zeal Optics eyewear on manufactural
defect cases. Lenses are excluded from this warranty unless
a manufacturer defect or lens os discovered. Normal wear or
abuse cases are not covered under this limited warranty.

Specs

Specifications:

Why Buy Polarised?:
Light waves travel in all directions: horizontally, vertically,
and on every plane in between. When light strikes a surface,
some waves are reflected. The reflected light waves tend to
vibrate in parallel planes. This uniform, non-random concentration
of reflected light is commonly referred to as glare. Glare
is not only unpleasant but is a common cause of eye strain
and fatigue; it can also be dangerous because it reduces contrast
and visual acuity.

Polarised lenses are designed to substantially
reduce or eliminate reflective glare by selectively absorbing
the light waves travelling in all directions except the vertical
plane. The term “polarised” is used to describe
light that has passed through a polarising filter. As a result
of passing through the filter, the transmitted light travels
in a uniform pattern.

Ordinary darkly tinted sunglasses do not remove glare and
may reduce vision by limiting the amount of light entering
the eye. It is not necessary to apply additional tint to polarised
lenses because performance is gained by cutting glare and
allowing a greater transmission of light. This results in
better overall vision.

The exclusive ZB-13 POLARISED blended ‘sepia’
lens colour soothes your eyes, enhances vision and allows
for your eyes to adjust to the always-changing light conditions.
It provides the optimum blend of contrast, clarity and light
transmission for all day COMFORT for your eyes.

The layered polarised lens filter cuts out
the glare experienced with outdoor environments and means
enhanced vision in a wider range of conditions.

Complete with Lifetime Warranty - Zeal Optics
offer a liftetime warranty on all Zeal Optics eyewear on manufactural
defect cases. Lenses are excluded from this warranty unless
a manufacturer defect or lens os discovered. Normal wear or
abuse cases are not covered under this limited warranty.

The eye is one of the most sensitive and valuable organs of
the body, and requires maximum protection from damage. Although
the sun is necessary and beneficial to our existence, when
it’s light rays (especially ultraviolet light) act upon
the unprotected eye, damage to this vital organ may occur.
The cornea is your eye's first barrier of defence against
the sun's harmful rays. It is a transparent layer of cells
covering the outermost surface of the eye. Day to day exposure
to ultraviolet light causes constant minor damage to the cornea
that is quickly and continually repaired. However, intense
ultraviolet light reflected from sand, water, or snow can
overwhelm the repair mechanisms and produce corneal burn (known
as snow blindness or photokeratitis).

The symptoms of photokeratitis - the sensation
of having something in the eye or, in more severe cases, pain,
tears, and intense sensitivity to light - usually develop
after a period of four or five hours of intense exposure to
the sun. Even if untreated, photokeratitis usually lasts only
one or two days. Any ultraviolet light that gets past the
cornea next encounters the lens of the eye - a transparent,
elastic structure responsible for focusing light on the retina.

The lens absorbs the remaining ultraviolet
light and passes only visible light to the retina. Unlike
the cornea, the lens has little ability to repair itself;
damage is cumulative and permanent. Recent evidence suggests
that chronic, lifetime exposure to UV contribute to some types
of cataracts (opaque regions in the lens that interfere with
vision).

Light reaches its final destination when it
strikes the cells of the retina, the innermost layer of the
eye. Pigment in these cells (called rods and cones) absorbs
light and initiates a series of chemical and electrical changes
that convey visual information to the brain. The chemical
changes associated with vision are reversible, and the pigment
is also constantly renewed. It is possible however, that light
at the blue end of the visible spectrum damages important
proteins in the retina that are not easily repaired. The macula
lutea is a portion of the retina located directly in line
with the centre of the lens. It is densely packed with light
detectors and is responsible for what is known as central
vision. In some people the macula degenerates after 50 or
60 years of service.

Although total blindness does not result,
the condition can be frustrating or disabling: the ability
to read or to use the eyes for other kinds of detailed perception
is lost. Given the combination of proven and possible eye
injury from ultraviolet light, sunglasses would seem like
a good investment - especially for people in sunny climates,
those with outdoor occupations, and for those who favor outdoor
recreation.

Light:

To understand sunglasses and the need for them, it is important
to understand light. That is a question that has puzzled philosophers
and physicists for years.

Here's what is known: The sun emits a broad
spectrum of electromagnetic energy that ranges from cosmic
rays at one end to radio waves at the other. Light is an electromagnetic
wave.

Light travels at a speed of 186,000 miles
per second.

Wavelengths of light are measured in nanometers
(I nanometer = I billionth of a meter in length). Light's
wavelength determines its colour. Generally speaking, shorter
wavelengths carry more energy and potential for damage to
your eyes. The electromagnetic spectrum consists not only
of the visible light that we detect with our eyes but also
invisible rays as well. These regions differ in terms of their
frequencies, wavelengths and how they interact with each other.

In the sunglass world, we are concerned with the regions of
the spectrum that affect our eyes. These are the ultraviolet,
visible, and infrared wavelengths.

Ultraviolet Light:

Ultraviolet light, with wavelengths from 0 - 380 nanometers,
is the light just short of visible light. There are three
types or classes of ultraviolet rays:

UVC:
UVC rays are the highest energy ultraviolet rays and are thought
to be carcinogenic. They occupy a range from 200 - 290 nanometers.
Fortunately, UVC rays are absorbed in the ozone layer of the
atmosphere, so few, if any, reach the earth.

UVB: UVB rays,
from 290 - 315 nanometers, are the trouble rays of ultraviolet
light and the ones that should be of most concern for the
sunglass wearer. These rays, the same ones that produce sunburn,
are absorbed by the cornea.

As previously mentioned, UVB rays can damage
corneal cells. But under normal conditions the cornea repairs
itself so rapidly that it usually keeps up with the assault.
Under extremely bright conditions, prolonged UVB exposure
can overwhelm the cornea's repair processes, causing painful
snow blindness (photokeratitis), Even so, the cornea will
usually recover within a day or two.

The chief worry about UVB damage centres on the lens of the
eye. Although ultraviolet light does not detectably damage
the lens in the short term; continuous, lifetime exposure
to UVB may contribute to the formation of cataracts.

UVA: UVA rays,
from 315 - 380 nanometers, cause tanning and premature ageing
of the skin. UVA also passes through the outer structure of
the eye and is absorbed by the lens.

Although UVA can be detrimental, it is much
less harmful than UVB. STANDARDS FOR SUNGLASSES AND UV PROTECTION
Sunglass use categories are standards prepared by the American
National Standards Institute (ANSI). The ANSI standard is
the only recognised criterion for the properties of performance
of non-prescription sunglasses and fashion eyewear. ANSI put
sunglasses into three categories:

Cosmetic Sunglasses: These lightly tinted lenses are for use
in non-harsh sunlight like shopping and around town uses.
These sunglasses block at least 70% of UVB and may block up
to 60 % of visible light. UVA protection must be at least
as great as visible light protection.

General Purpose Sunglasses: These are medium
to dark tinted lenses for use in any outdoor activity like
going to the beach, boating, hiking, and snow use. These sunglasses
must block at least 95% of UVB, 60-92% of visible light, and
at least 60% of UVA.

Special Purpose Sunglasses: These lenses are
recommended for very bright conditions like mountain climbing.
These sunglasses must block at least 99% of UVB, 97% of visible
light, and up to 98.5% of UVA.

The UV Index:

Developed by the National Weather Service and the Environmental
Protection Agency, the UV Index provides you with a measure
of the relative intensity of the sun's UV radiation. The greater
the UV radiation, the higher the index number.

Exposure Category

UV Index Value

Minimal

0-2

Low

3-4

Moderate

5-6

High

7-9

Very High

10+

The UV Index can be found on TV (The Weather Station), radio,
or in newspapers.

What
affects the UV Index?:

Time of Day: UV radiation is greatest at midday.
In fact, over 50% of daily UV radiation occur between the
hours of 10:00 a.m. and 4:00 p.m.

THE SEASON: UV RADIATION IS HIGHER IN SPRING, SUMMER, AND
AUTUMN THAN IT IS IN WINTER.

Cloud Cover: Thick, heavy clouds absorb most UV radiation.
In general, he darker the clouds, the less the UV radiation.
But extra care should be taken under thin clouds. While the
sun's rays may not feel as hot, they can still cause damage
because UV radiation passes through thin clouds. Also, watch
out for hazy conditions; haze does not block UV radiation.

The Environment: You get higher exposure to
UV radiation on snow, sand, water, or concrete, as these surfaces
reflect the suns rays. You'll also get higher UV radiation
at higher altitudes and areas closer to the equator.

Glare:

The same bright sunlight that draws us outdoors,
can also cause eye strain and fatigue. These discomforts are
often the result of glare from light reflected off many of
the surfaces that surround us.

Glare is not only unpleasant; it can also
be dangerous because it reduces contrast and visual acuity.
Sources of glare include: water, snow, airborne water particles,
dust, buildings, concrete, ice, sand, wet and dry road surfaces,
and windshields.Preventing Eye Damage:

Because UV rays can cause cataracts and other serious eye
conditions, doctors recommend that you wear sunglasses that
absorb 99-100 percent of the full UV spectrum when outdoors
in bright sun. Because there is now no uniform labelling of
sunglasses, read labels carefully.

Be careful of buying sunglasses that 'block
harmful UV' without saying how much. Wear a hat with a wide
brim to protect against UV exposure, and if you wear sunglasses,
too, you provide even more protection for your eyes.

Parents whose children will not wear sunglasses,
can still help protect their children's eyes by making sure
they wear a hat with a wide brim.